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First, the working principle of ultrasonic metal welding machine
Ultrasonic metal welding machines weld non-ferromagnetic metal material workpieces by high-frequency mechanical vibration. During the welding process, one of the workpieces is fixed, and the other workpiece is circulated and reciprocated on the surface at a frequency of 20/40 kHz, and pressure is applied to the workpiece to form a firm bond between the workpieces, thereby achieving the welding effect. . The entire welding process can be precisely controlled without excessive heat generation on the metal surface and strong soldering fastness.
The ultrasonic metal welding machine converts the current 50/60Hz electric frequency into 20KHz or 40KHz electric energy high-frequency electric energy through a transistor function device, and supplies it to the ultrasonic welding machine converter. The converter converts electrical energy into mechanical vibrational energy for the ultrasonic wave, and the pressure regulating device is responsible for transmitting the converted mechanical energy to the welding head of the ultrasonic welding machine.
The welding head of the ultrasonic metal welding machine is an acoustic device that transmits the mechanical vibration energy directly to the product to be pressed. The vibration is transmitted to the bonding surface by the welding work piece, and the friction generates heat to melt the plastic, and the vibration will reach in the molten state. When the interface is stopped, the short-term pressure can cause the melt to produce a strong molecular bond when the adhesive surface is solidified. The entire cycle is usually completed in less than one second, but the welding strength is close to a connected material.
Second, ultrasonic welding application method
1. Welding method:
The welding head vibrating at ultrasonic ultra-high frequency makes the frictional heat of the joint surface of the two plastics melt and join at a moderate pressure. The welding strength can be compared with the body, and the water-tightness can be achieved by using suitable workpieces and reasonable interface design. It is airtight and eliminates the inconvenience caused by the use of auxiliary materials to achieve efficient and clean welding.
2, the welding method:
The ultrasonic welding head with ultra-high frequency vibration is pressed against the protruding tip of the plastic product, so that the instant heat is melted into a rivet shape, and the materials of different materials are mechanically riveted together.
3. Implantation:
By means of the welding head and proper pressure, metal parts (such as nuts, screws, etc.) are squeezed into the plastic hole and fixed at a certain depth. After completion, the tension and torque can be compared with the traditional mold. The strength can eliminate the shortcomings of the injection mold damage and slow injection.
4, molding:
The method is similar to the rivet welding method, in which the concave welding head is pressed against the outer ring of the plastic product, and the ultrasonic welding of the ultrasonic hair after the ultra-high frequency vibration is applied to the metal object to be fixed, and the appearance is smooth and beautiful. The method is mostly used in the fixed forming of electronic products and horns, and the fixing of lenses for cosmetics.
5, spot welding:
A. Weld the two plastic points without pre-designing the bonding wire to achieve the purpose of welding.
B. For relatively large workpieces, it is not easy to design the workpiece of the welding wire for point welding, and the welding effect can be achieved, and multiple points can be spot welded at the same time.
6, cutting and sealing:
The principle of ultrasonic vibration is used to cut the chemical fiber fabric, and the advantages of the slit are smooth and not cracked or drawn.
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